Just had the message AL11 show up which means low water. However, the tank was full. After taking the top off I saw that the middle wire that attaches to a shield spade connector had become detached. The wire which is the low water sensor, is quite thin, was out of the plastic connector which was still attached to the other connector
The problem is that these connectors are not designed to be reused. I think the spade connector is attached then pushed into the plastic shield which grips it to stop it being pulled out. As I didnt have a new shielded connector I thought I’d just attach 2 standard spades to get it working. I put a small cable tie around the tube where it passes through the hole in the stainless sheet on the other side of the tank to stop it being pulled when I fill the tank. Seems to have worked.
I will try and get a male shielded spade cover to to do a complete job but just have to get an identical size so it will fit the female one on the machine. I think the part of the original connector that grips the covered part of the wire was not crimped hard enough - which did look tricky as it is a very thin gauge wire, so was able to be pulled out when I removed the tank for cleaning.